gemstone
Chrysoprase
Chalcedony with nickel impurities (SiO2)
Mohs hardness: 6.5-7, Color: Apple green to deep green, Luster: Waxy to vitreous, Crystal structure: Cryptocrystalline, Cleavage: None, Specific gravity: 2.58-2.64
- Hardness
- 6
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Physical properties
Mohs hardness: 6.5-7, Color: Apple green to deep green, Luster: Waxy to vitreous, Crystal structure: Cryptocrystalline, Cleavage: None, Specific gravity: 2.58-2.64
Formation & geological history
Forms as a secondary mineral in the weathered zones of nickel-bearing serpentinites and other ultramafic rocks.
Uses & applications
Used primarily as a gemstone in jewelry, often cut into cabochons or beads.
Geological facts
Chrysoprase is one of the most valuable varieties of chalcedony. Its green color is due to trace amounts of nickel compounds.
Field identification & locations
Identified by its distinctive apple-green color and waxy luster. Commonly found in Australia (Queensland), Germany, Poland, Russia, and the USA.
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